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Table of Contents
Chapter 1 Administration
Chapter 2 Definitions
Chapter 3 General Regulations
Chapter 4 Ventilation.
Chapter 5 Exhaust Systems
Chapter 6 Duct Systems
Chapter 7 Combustion Air
Chapter 8 Chimneys & Vents
Chapter 9 Specific Appliances
Chapter 10 Boilers, Water Htrs
Chapter 11 Refrigeration
Chapter 12 Hydronic Piping
Chapter 13 Fuel Oil Piping
Chapter 14 Solar Systems
POLICY
OTHER
Chapter 1 Administration:
1) (Q) Is it the responsibility of a plans examiner or inspector to inform a designer or contractor
of additional requirements of other State agencies or licensing boards?
(A) No. It is not the responsibility of the inspector or plans examiner. It shall be the
responsibility of the permit holder, design professional, contractor, or occupational
license holder to determine whether any additional requirements exist. 101.5
2) (Q) Are explosion proof condensate pumps allowed to be installed on the floor of
a garage?
(A) Yes. Although a condensate pump, by definition would not be considered an
appliance, when used in conjunction with heating and/or air conditioning
equipment, it becomes an appurtenance to that appliance.
Condensate pumps, used as an appurtenance to a heating/cooling appliance
which generates a glow, spark or flame, capable of igniting gasoline vapors and
located in a garage shall be installed with burners, burner ignition devices or
heating elements and switches at least 18 inches above the floor level.
Condensate pumps installed on the floor of the garage must be listed and labeled
for installation in a Class 1, Division 2 location, as specified in the NEC, Article
500. An "explosion proof" rating, by itself, does not necessarily mean the
equipment will meet this requirement. Listed equipment will be marked to show
the class, group (division) and operating temperature or temperature range in
which the equipment can be used. The identification numbers are marked on the
equipment nameplate. Ref: 102.9
3)
(Q) The trading floor of a large office building is being renovated. They are using the re-hab
code for the renovation. The floor will require phasing the construction to complete the
work. The first stage will only have equipment capable of supplying outside air for the
initial 40 people that will occupy the trading floor. They will not move the other
employees in the building until the OA equipment is in place. Should we allow the
installation to be phased for additional OA?
(A) Yes. The designers will keep the CA and field inspectors informed at each stage of
completion as to scheduling and equipment information. Ref: 102.9 (MC)
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Chapter 3 General Requirements:
1) (Q) What are the requirements for systems installed in a flood plain?
(A) Section 301.13 Flood hazard: For structures located in flood hazard areas, mechanical
systems, equipment and appliances shall be located at or above the design flood
elevation. Exception: Mechanical systems, equipment and appliances are permittedto
be located below the design flood elevation provided that they are designed andinstalled
to prevent water from entering or accumulating within the components and to resist
hydrostatic and hydrodynamic loads and stresses, including theeffects of buoyancy,
during the occurrence of flooding to the design flood elevationin compliance with the
flood-resistant construction requirements of the International Building Code.301.13.1
High-velocity wave action. In flood hazard areas subject to high-velocity wave action,
mechanical systems and equipment shall not be mounted on or penetrate walls intended
to break away under flood loads. See also section 602.4 for similar the requirements
covering the duct system.
2) (Q) Would the discharge line of an appliance condensate pump need to be protected from
freezing temperatures?
(A) Chapter 307 does not address the protection of condensate discharge lines, installed in
areas subject to freezing temperatures, however, we would be remiss if we did not
require this protection in areas such as a ventilated attic space. Other areas of concern
would be where the line exits the foundation wall. We would “recommend” that these
installations be sloped downward and increasing in pipe size to limit blockages.
3) (Q) What type of access would be required for a boiler installation where the boiler devices
may be subject to vandalism or component theft?
(A) Chapter 306 covers the typical installation of equipment. Section 105.1 Would allow us
the flexibility to allow alternative access on a case by case basis.
4) Q) Where are the seismic strapping requirements for air conditioners and/or heat
pumps in the NC Mechanical Code?
(A) Seismic requirements and zone information is in the Building Code as
referenced by 301.15 of the Mechanical Code.
5) (Q Do copper condensate lines or return piping of heating/cooling units that are in direct
contact with galvanized sheet metal duct and/or plenum constitute a potential for galvanic
action?
(A) It is recommended that piping be protected from potential corrosion by protecting or
isolating the piping. 307.2.2
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6)
(Q) What is the proper way to protect an appliance in a residential garage?
(A) From the information we have from DOI and past practice if you pulled a straight
edge from the garage door opening to the rear of the opening, if the appliance in
question was not in the normal path of the vehicle, then no protection is required. No
what if’s Ref: 303.4
7)
(Q) A mechanical contractor requested an interpretation as to whether traps were required
on the condensate from an evaporator coil and if we knew of any conflicts with the
energy code involving cleanout vent/ tees on a blow-through unit discharging into an
unconditioned area (attic/crawl space)?
(A) The code requires the inspector to rely on the manufacturer’s data to determine
if a trapped drain is required. If any conflicts with other codes are apparent then
the contractor may need to consult with the manufacturer to resolve the problem and
inform the inspector of the issues. Ref: 307.2.4
Chapter 4 Ventilation:
1)
(Q) What is the minimum ventilation required for toilet rooms?
(A) Toilet rooms are not considered to be habitable space and so their
ventilation requirements would be found in table 403.3 which would require
mechanical exhaust and not natural ventilation. Note: We have allowed natural
ventilation in the past and we will begin enforcing the mechanical ventilation
requirement on permits obtained after April 1, 2011.
2)
(Q) The M/P plans examiner has turned a plan down because the designer has used
incorrect Outside Air calculation information. The designer contacts the CE to
explain the calculation is from the ASHRAE 69 calculations in the 2012 Mechanical
Code. Replacing the equipment to meet current code would add significant cost to
the project. The existing equipment will work based on the new 2012 calculation.
Should the designer be allowed to use the new code calcs for the outside air?
(A) Yes. Since the new code is adopted by the BCC and is in effect September 1st, 2011.
Section 403.3 and Table 403.3. (MC)
Chapter 5 Exhaust Systems:
1) (Q) Does Mecklenburg County allow an alternative method for type I hood
clearances?
(A) Mecklenburg County allows the use of NFPA 96, Chapter 4.2.3.2 based
on an interpretation by DOI dated 2/2/2004.
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2) (Q) In an automotive repair garage with a vehicle exhaust source capture system per NCMC
502.14, is it permitted to have one (1) –exhaust capture connection for every two (2) bays
or is one connection only allowed per bay?
(A) The Mechanical Code is silent on this question, however the code language gives the
inference that it requires a singular; “a source capture system” for each vehicle or
service bay. One per bay is required. Ref: 502.14
3) (Q) Even though the code requirements have been met for the installation of the grease duct
the contractor wants to add several more cleanout openings because he also has the
maintenance contract on the grease duct system. The duct is only 10 inches by 10 inches
and the code access door manufacturer informs him the smallest door approved for
grease duct installation per code is 12 inches by 12 inches. Can the contractor make his
own door to access the grease duct?
(A) Yes. Where the duct is smaller than the 12 by 12 minimum the mechanical contractor
may provide cleanouts approved by the mechanical official at least equivalent to the
minimum requirements of the code for manufactured access doors. Ref: 506.3.9
4) (Q)The Mechanical inspector has turned a residential range exhaust installation down
because the contractor has used screws to join the pipe together and then sealed the pipe
joints with mastic. The pipe extends up through the roof and is terminated per code. Is this
inspector correct? Is this a code violation?
(A) The inspector may consider this a code violation; reference is 505.1 “smooth inner
walls,” however there are minimal code restrictions on residential hood installations.
While the code reference says smooth we would accept small screws and mastic to
fasten the duct joints together. Ref: 505.1
5) (Q) A contractor asks the inspector if he can combine the bathroom exhaust with the dryer
exhaust to value engineer the job for the owner and appease the Architect who is
complaining about all of the exterior wall penetrations disturbing the ambiance of his
finished exterior walls. Can the inspector allow this installation? Will a redesign in duct
sizing, fittings or joints be required?
(A) No. No comingling of the dryer exhaust is allowed by code. Ref: 504.1
6) (Q) A battery room is installed in an existing multistory building. The designer says it is
virtually impossible to run the exhaust duct up to the roof because of the tenants and
space in the ceiling above so he wants to run the duct into an area way in the middle of
the building that is enclosed on all four sides similar to an interior courtyard in an office
building. The only thing located in the area way are 10 compressors for AC to the
various building tenants. His problem with running the duct to the area way is that he can
only get 3 feet of clearance to terminate the exhaust duct. Can this installation be allowed
per Code?
(A) No, Ref: 501.2.1 sub (1) for conveyance of flammable/explosive vapors.
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7) (Q) A UL listed grease duct installation for a type I hood is called for inspection. Duct joints
are not welded per code requirements; however, the installation instructions show
approved joint connections without welded joints. What would the inspector be required
to inspect? How does the inspector look at the installation for code compliance? What
tests are required for system approval?
(A) Inspection of the manufactured system would have to comply with all standard tests
for grease duct required for type I hoods including 506.3.2.5. Any tests specified in the
manufacturers literature will also be the responsibility of the field inspector. Ref:
506.3.2.5
8) (Q) Under what conditions can an outdoor grill and hood be installed under a covered porch?
(A) The hood would be approved if installed per the manufacturer’s installation
instructions, including the correct fan, and unit sizing-and it is used in a single family
detached dwelling. No townhouse/condo/apartment use would be allowed. Ref: 506.4.1
9) (Q) A manufacturer has submitted a dryer booster fan to be used in a residential application
per IRC 1501. Would the inspector approve the booster fan if the contractor has the
letter on site for the inspection?
(A) Dryer booster fans are not allowed by the code. There is no code language to allow
their use. Ref: 504.1
10) (Q) A counter mounted, induction type, two burner range with a down draft exhaust filter is installed
on a counter top in a restaurant open bar buffet. The appliance is cord and plug connected 208V
three phase with two burners. The manufacturer does not think a hood or fire suppression system
should be required since the unit will be used for sauté and warming only. Should a hood and fire
suppression system be required?
(A) Yes. The food is producing grease laden vapors and therefore should have a hood and
suppression system installed per code. Ref: 507.2.1
11) (Q)The designer of a hood system wants to use the filter at the hood as the only means to protect
the ductwork from grease laden vapors. The designer wants to terminate on the outside wall in a
louver flush with the wall. No other exhausting means will be provided. Should we allow this
installation?
(A) No. We currently allow a variance from the code for downtown buildings and other buildings
where the designer wants to avoid a sidewall standard hood installation that extends 40 inches
into an alley, street, sidewalk or other public way. A filter located at the hood could be
removed or replaced more conveniently than the scrubber system or environmental air
filtration systems we currently allow for a louvered wall termination. (See web site document
for exceptions) Ref: 506.3.12
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Chapter 6 Duct Systems:
1)
(Q) What method can be used to protect the opening in a floor/ceiling or roof/ceiling
assembly where supply duct from the HVAC unit penetrates the assembly? NOT
There is not a fire damper currently manufactured that is approved for this application
when the multi-story building is classified as an R2 occupancy with type V construction
.
(A) The current code approval for this application requires a smoke detector to be
installed in the same room as the HVAC unit that will shut down the unit if smoke is
detected. The smoke detector shall tie in to the smoke detector circuit provided for
the apt/condo unit. A static damper is required at the ceiling penetration of the
HVAC duct penetrations from the unit. This method of protecting the ceiling
penetrations is only approved until a Fire Damper is manufactured that provides
adequate protection for the openings.
2)
(Q) What are the minimum requirements for plenum rated materials within an open ai
plenum space?
(A) Not required. See plenum definition. Open air returns are typically in
habitable areas and do not have to conform to the material requirements of enclosed
plenums. Example: Home Depot. Ref: Chapter 2 plenum definition. & 602.2.1
3)
(Q) Unlisted duct tape has been installed on the metal to metal and flex to metal airduct
joints a furnace installation in a single-family dwelling. Is it required that the unlisted
duct tape be removed before installing the approved tape or mastic?
(A) No, approved tape may be installed over unlisted duct tape unless the listing,
labeling or manufacturer’s instructions supersede the allowance of such material.
Ref: 603.9
4)
(Q) What is considered proper access for smoke/fire dampers?
(A) 607.5 states that the damper must be accessible for removal/maintenance.
5)
(Q) Are fire dampers, smoke dampers, or combination dampers required in walls that
separate a garage from the residential living space in a single family dwelling?
(A) The code has no provisions for a fire damper of any type to be required in this
residential installation. 603.1.2
6)
(Q) Are longitudinal seams required to be sealed in a duct used to exhaust a bath fan?
(A) Yes. Our policy has always been to seal the seams in a longitudinal duct run in a
residential application to prevent any duct leakage on the ceiling. Recent DOI
interpretations of the 2012 code MC Section 603.9 back the department position to
seal the exhaust duct. The 2009 code vaguely describes “contamination prevention”
in 601.4 but exempts one and two family dwellings. Ref; 603.9
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7)
(Q) A listed and labeled product (return air grill) is being installed in a panned 2 by 4 wall
stud cavity. A return air grill is being installed in the wall cavity at a depth of 1 inch
leaving only 2 inches between the return collar and the filter. Is this installation allowed
by Code?
(A) The inspector must look at the surface area to determine if this installation will meet
code. Ref: 602.3, 605.2
8)
(Q) Charlotte Pipe has a new CPVC pipe called ChemDrain with a Zero flame spread rating
and a smoke developed rating of between 8 and 22 based on ULC S102.2. Can we allow
this new pipe in return air plenums?
(A)
Yes. As long as it is tested and approved for at least 25-50 smoke and flame
spread rating we would allow the product in return air plenums. Ref: 602.2.1
9)
(Q) A residential 3 story apartment building has louvered doors on a closet which is used for
the return air to the AC unit. The closet doors are made out of wood. (a)Is the closet
allowed to be used as part of the return? (b)Does the closet meet minimum requirements
for a return air plenum? (c) Could the doors be used in a commercial office space?
(A) (a) Yes. (b) Yes. (c) Plenums in dwellings are not required to meet the code
requirements for non-combustible materials within plenum spaces. Materials in
plenums for all other occupancies shall be non-combustible or meet 25-50
requirements. Ref; 602.2, 602.2.1, 602.2.1 exception # 3.
10)
(Q) What are the minimum requirements for access to a fire damper located inside a duct
when the ductwork is located behind a sheet rock wall? Would the requirements be the
same for commercial and residential construction?
(A) The access shall be by an approved means large enough to permit inspection and
maintenanceof the damper and its operating parts. The access opening shall not
affect the integrity of fire-resistance rated assemblies. Access doors in ducts shall be
tight fitting and suitable for the required duct construction. Ref: 607.4 [B]
11)
(Q) The designer on a multi story building wants the fan shut down to be a function of the
Building Mechanical system wiring for the fan powered terminal boxes. By using this
option it will enable restart of the fans and gives the end user more monitoring ability.
With this capability the Fire Alarm panel will send a signal to the nearest BMS panel
which in turn will send a signal to all the fans to shut down. Under what
circumstances would we allow this installation?
(A) Terminal units with a capacity of less than 2000 cfm (greater than 2000 cfm must
have its own individual smoke detector) may be interlocked with the smoke
detector locatedat the primary air-handling unit which serves the terminal units.
When the interlock option has been selected we will allow it to be interlocked
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through the Fire Alarm Panel utilizing the Building Mechanical System Panel and
associated wiring. Note: all wiring located in a plenum must be plenum rated.
Ref: 606.2 (MC)
12)
(Q) What are the clearances required on a vertical grease duct from a Type I hood
penetrating a metal pan deck on an unrated single story roof deck when the following
conditions exist: 1 The roof curb adapter is 18 inches high and fastened to the roof pan
decking. 2. The roof insulation stops 12 inches away from the curbing. 3. Rubber
roofing materials are bonded to the outside of the roof curb. Would the roof hood duct
require wrapping under the circumstances stated above?
(A) No. NFPA guidelines equate 18inches above the roof to be equivalent to a fire
damper located at the roof penetration. Wrapping would not be required in the
example above.
Chapter 9 Specific Appliances, Fireplaces and Solid Fuel-Burning Equipment:
1)
(Q) What is the minimum clearance of a microwave oven hung under an existing stove
cook top? The manufacturer’s instructions require a 24 inch clearance. This clearance
will work but just barely because of the existing cabinet height. The house is in a
historical district and the governing board does not allow removal or alteration of
existing cabinets in the district. Can the inspector allow the manufacturers approved
clearance?
(A) Yes. Install the equipment per manufacturer’s clearances. Ref: 917.4
Chapter 10 Boilers, Water Heaters and Pressure Vessels:
(1)
(Q) An out of state jurisdiction ask the department about the enforcement of ASME Boiler
and Pressure vessel regulation enforcement for the state of North Carolina. Who
enforces regulations for UNFIRED pressure vessels for (1) Newly installed pressure
vessels to comply with ASME Boiler and Pressure Vessel Code, (2) Repairs and
alterations for existing boilers, and (3) Other regulations or codes that also apply to
boilers?
(A) The Department of Labor Boiler and Pressure Vessel division has primary
responsibility over boiler inspections, however there is a list of exempt boilers. The
exempt boilers are governed by the North Carolina Mechanical and Fuel Gas codes
as enforced by the Office of the State Fire Marshall through the Department of
Insurance. Ref: Ch. 10 and NCGS 95-69.10/ BPV Rules.
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(2)
(Q) When the stamping on a pressure-retaining item becomes indistinct or the nameplate is
lost, illegible, or loose, but traceability to the original pressure-retaining item is still
possible, can a new nameplate be made and attached to the existing boiler?
(A) Yes. All re-stamping must be done in accordance with the original code of construction.
Requests for permission to re-stamp or replace nameplates must be made to the
jurisdiction in which the pressure-retaining item is located. The jurisdiction may grant
such requests if satisfied with the information submitted. Permission from the
jurisdiction is not required for the reattachment of nameplates that are loose or not fully
attached. When traceability cannot be established, the jurisdiction must be contacted.
Ref; 105, 301.4, 1004.1, 1004.2
(3)
(Q) If multiple water heaters were piped together for space heating, would
Btu's and volume combine to make the system a boiler?
(A) No. See boiler definition 1001.1 Exception 7, NC Dept of Labor
Chapter 95. Note: The combined BTU’s will be used to calculate
combustion and ventilation air requirements. Ref: 1001.1 definition and
exception 7, NC Dept. of Labor Chapter 95.
Chapter 11 Refrigeration:
1)
2)
(Q)An existing chiller is being replaced. The existing chiller uses R-22. The chiller is in
an existing mechanical room. The new chiller will be using the more environmentally
friendly R-410-A refrigerant. The existing chiller room has a volume of 925 sq. feet
and a cu ft. volume of 12,025. The new chiller has 160 lb of R-410A in its largest
refrigerant circuit. The chillers quantity exceeds the capacity of the room as provided
for in the chart in tbl. 1103.1 2009 NC mech. Code. Table 1103.1 has been changed
in the 2012 North Carolina code and the quantity of R-410 has been reduced to
25lb/1000 cu. ft. There are no other changes in the code that would change the
quantities. Can the code official allow the new code quantities to be used so a separate
mechanical room will not be required?
(A) Since there are no other changes that would require the designer to build a
separate mechanical room the new table quantity is approved as an alternate
design. Ref: Table 1103.1- 2012 and Table 1103.1- 2009
(Q) Can recovered refrigerants be re-used by the same owner?
(A) Yes. They shall be filtered and dried and they may also be required to be
reclaimed if clear signs of contamination exist. Ref; 1102.2.2.2
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3)
(Q) Can reclaimed refrigerants be used in a different owner’s equipment? REF: 1102.2.2.3
(A) Yes. The refrigerant must be tested and found to meet ARI 700 test requirements.
Policy: Includes Energy Conservation and Re-Hab Codes
1) (Q) When is a refrigeration permit required?
(A) A refrigeration permit is required for any refrigeration equipment required to be
assembled (excluding the walk-in cooler box) OR any equipment required to be hard
wired electrically (not cord and plug type).
2) (Q) Is the outside air make-up air duct located on the non-insulated side of an attic space in
a single family dwelling required to be insulated?
(A) No. The temperature difference between the air in the make-up air duct
and the air temperature in the attic are not sufficient to cause condensate
that would require insulating the duct. Ref: 503.2.7, Exception #2, North Carolina
Energy Conservation Code
3) (Q)When does a Mechanical Inspector enforce the Carbon Monoxide Alarm requirements
adopted by the NC Department of Insurance in One-and-Two-Family Dwellings and
Townhouses? Effective date: January 1, 2011.
(A) 2009 NC Residential Code revisions to Section R313 as provided below:
R313.1.1 Carbon Monoxide alarms. In new construction, dwelling units shall be
provided with an approved carbon monoxide alarm installed outside of each separate
sleeping area in the immediate vicinity of the bedroom(s) as directed by the alarm
manufacturer. R313.1.2 Where required-existing dwellings. In existing dwellings,
where interior alterations, repairs, fuel-fired appliance replacements, or additions
requiring a permit occur, or where one or more sleeping rooms are added or created,
carbon monoxide alarms shall be provided in accordance with Section 313.1.1.
R313.1.3 The required carbon monoxide alarms shall be audible in all bedrooms over
background noise levels with all intervening doors closed. Single station carbon
monoxide alarms shall be listed as complying with UL 2034 and shall be installed in
accordance with this code and the manufacturer’s installation instructions.
4) (Q Can R-4 insulated Flex be used in Icynene insulated attics where a thermal barrier is
above the ductwork?
(A) Yes. It can be used as long as the attic is now part of the thermal envelope and properly
sealed. Ref: 503.2.7, NC Energy Conservation Code
5) (Q) Does the code limit the noise level produced by heat pumps and air conditioners?
(A) No. There are not any requirements restricting the noise levels of this equipment in the
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current code. Local ordinances dictate noise levels and are not enforced by building
code enforcement officials in Mecklenburg County.
6) (Q) When extending gas pipe to non-electrical gas equipment (barbecue, insert, are you
required to bond the existing gas pipe connected to an existing gas or electrical appliance?
(A) No, unless the alteration creates the potential to be energized.
Administrative Information
1) (Q) A mechanical contractor is adding economizers to existing commercial air conditioning units on a
roof. Are permits required to add economizers to the existing units? Are plans required before a
permit can be issued?
(A) Permits are required per the North Carolina Administrative Code. Plans may be required
dependent upon the scope of work and energy code requirements. CTAC usually determines if this
information is needed prior to issuing a permit. Ref: North Carolina State Building Code:
Administrative Code and Policies
2) (Q) Does the Department of Insurance still maintain a list of third party approved agencies
for Electrical, Mechanical, Plumbing and Fuel Gas products? It is my understanding they did
away with the list.
(A) Yes. The Department of Insurance still has the approve list of third party testing
agencies on its web site but only for Electrical and Mechanical Equipment. Go to:
http://wwwNCDOI.com/OSFM/Engineering/BCC/engineering bcc third party. ASP
3) (Q) I am a homeowner and I have a complaint about a licensed Mechanical Contractor. The
contractor did not complete the work in the contract. Who do I call to file a complaint?
(A) Contact John Todaro, he is the area representative for the North Carolina Board of
Plumbing, Heating and Fire Sprinkler Contractors. His email address is:
jtodaro@NCLICENSING.ORG
.
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